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PCM - Delayed Idle Return/MIL ON/DTC P0320 Set

Bulletin No.: 002/99
Issued: 02/16/99
Revised

Applicable Model/s
1998-99 B-Series

Subject
DELAYED RETURN TO IDLE AND/OR MIL "ON"
DTC P0320

APPLICABLE MODEL(S)/VINS

All 1998-99 B-2500 with manual transmission (3.73 axle ratio only).

DESCRIPTION

Some vehicles may exhibit a delay at 1300-2000 engine rpms before returning to normal idle. The condition occurs on closed throttle deceleration in neutral or with the clutch depressed. There may also be illumination of the Malfunction Indicator Lamp (MIL) and Diagnostic Trouble Code (DTC) P0320 may be stored in memory. These conditions may be caused by the Powertrain Control Module (PCM).

Customers having this concern should have their vehicle repaired using the following procedure.

Note
^ This modification will only correct this specific condition.

Warning
^ This modification is authorized only for the listed engine(s). Performing this modification on other engine calibrations is unauthorized and could create liability under applicable federal or local laws.

REPAIR PROCEDURE

Note
^ This modification should only be performed if all other components related to idle control have been verified to be working properly. (See diagnostic index in section 01 of Workshop Manual)

1. Verify customer complaint.





2. Select the appropriate card (SST part number 49G0-88-016) and reprogram the PCM using one of the following calibrations. Refer to the "In-Car Flash Procedure" in this bulletin.

^ 9B1M-AB (Federal)
^ 9B1M-BA (California)

Note

^ PCM replacement is not authorized by this Service Bulletin. Refer to section (01) of the Workshop Manual for diagnostic procedures if PCM hardware concerns exist.

3. Verify repair.

WARRANTY INFORMATION

Note
^ This information applies to verified customer complaints on vehicles covered under normal warranty. Refer to the SRT microfiche for warranty term information.

Warranty Type A

Symptom Code 07 or 6X

Damage Code 9W

Part Number Main Cause **** 18 881

Quantity 0

Operation Number /
Labor Hours YY182XRX / 0.6

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